Storable Data

Per the Developer Terms of Service, you may not cache any user data for more than 24 hours, with the exception of information
that is explicitly "storable indefinitely". Only the following parameters are storable indefinitely; all other information must be requested from FatSecret each time.

FatSecret data you can store indefinitely include:

food_id - the unique food identifier.

food_entry_id - the unique identifier of the food diary entry.

serving_id - the unique serving identifier.

recipe_id - the unique recipe identifier.

saved_meal_id - the unique saved meal identifier.

saved_meal_item_id - the unique saved meal item identifier.

exercise_id - the unique exercise identifier.

In addition, you may store the auth_token and auth_secret.

The storable IDs enable you to keep unique identifiers for FatSecret elements that correspond to data gathered by your application.